2021-2022学年内蒙古兴安盟突泉县七年级（下）期末数学试卷（附答案详解）

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2021-2022
ᑁℳᐶ
ᦪᔁ1.2022
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215.᝞O%uvwḄxᑖy“z”]G{|2,—1“8”]G{|4,1ᑣ“”ᡠᙠḄ{Ḅᙶ᪗%.16.᝞OᩩbᑮB◤.᝞pTḄ74%110஺pnTḄ7NB%140஺pTḄ7NC,IḄ⍝pᩩEFC%17.ᐵGxḄ9a,I1ា¢£ᨵA᦮ᦪmᑣ஺Ḅ¦§©'.18.«¬|-12+—I-|-3219.m*+,:3x—2<%+620.m9a,²³2+i>x.21.᝞O¶C1BCG{஺EFJ.8CG{BºABG{G,ºC4Ḅ½R¾G{E,Z.E=43,ÀÁz.1=Z.2.22.Ä᪥5ÄÆḄÇ᜜▅ÊËÌFÍ᪵ÏÐÑᦈÓḄᦪÔᑖᡂAஹBஹCஹDஹE×,ÌF᦮ᳮÙÚᑴᡂ᝞/ḄÜ«O⊤|OMÞßà᦮.▅ÊËᑖ,Ü«⊤,D▅ÊËá|ᦪA040P

3âãᔠåÞßmæ/ᑡ!⚪(1)çèm=ஹn=ஹp=(2)⊡ᐰ“▅Êᦪᑖ,Ü«O”(3)ÀA,ᡧQḄᙊì7Ḅíᦪ(4)î«ᐰ᪥3200ïÄÆÇ᜜▅ÊËᙠ20ðå/(ñ20ð)ḄÄÆᦪ.23.᝞Oòó448஺ḄEᑖ¾BôõBDCḄEᑖ¾ºG{E,BFCDG{F.(1)ÀZ1+42Ḅíᦪ(2)y42=40஺À43Ḅíᦪ.24.᝞OᙠE☢Y7ᙶ᪗\xOyMòó{P(l,2).(1)ᙠE☢Y7ᙶ᪗\Mü{P(ýᶇÿ
)(2)᝞Pᔣ3ᓫᔣ1ᓫᑮP',P'Ḅᙶ᪗.(3)Aᙠᙶ᪗%&40)=2,+,ᑏ./0ᩩ2ḄAḄᙶ᪗.25.ூ678⚪௃;<=>+2'=@©+5yḄC.2%-y=6(2GHIJᐜLGMN.X,yḄCPᐭ.4x+5yḄC.GHSJজx2-ঝ.4x+5yḄC.V4⚓ᐳ15⚓

4ூY.8⚪௃Z᪵\]ᑮGHSᕖ_ூᑖ᪆8⚪௃bcᑮGHSdeজxm+ঝxn,d(3m+2n)x+(2m—n)y=4m+6n.fghi(3m+2n)x+(2m-n)y=4x+5y,jklᦪdnoSᓃC=-1-ூLq8⚪௃(1)rs⌱uIvGH4%+5yḄC(2)wxGMN=ᓅᑭᵨGHSḄ|}7%_7yḄCூ~ᵨ௃(3)<=ᨌ;2x—3yḄ.26.ᵬஹvᡝᙳvc₝⃉ℍ⃔vᡝvḄḄv☢ᦈᐭ᝞⊤:v₝⃉☢vℍ⃔☢ᦈᐭvᡝ(ᓫJ)(ᓫJ)(ᓫJᐗ)ᵬ32142518.5¡¢J£¤ᑭ¥ᡝvḄ¤¦ᙳᦈᐭ§g.(1)₝⃉ஹℍ⃔¦ᙳᦈᐭᔜ©ª«ᐗ_(2)¬vᡝᜓ¯15ᙢᵨᩭv₝⃉ஹℍ⃔bc²ᦈᐭ£³x40ᐗ´v₝⃉Ḅ☢£µ¶vℍ⃔Ḅ☢(Ḅv☢ᙳb᦮ᦪ)¸vᡝᡠᨵvGᫀ.

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X0.6”ᑡQJR.S⚪T⌕ὃW1ᵫX▭Z⚪[\Q(ᐗ(^JRX▭Z⚪ᑡ(ᐗ(^JR_✌a6⚓ᐳ15⚓

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7¨Í᪵SḄÏÐᐵÑgàὃWå\ḄÆ.᪵Sâãë¨ᦪìíᨵᓫ.8.ூᫀ௃Dூ᪆௃!•••16<19<25,5Ḅᐵ?.10.ூ>ᫀ௃4ூ2᪆௃2ᵫ⚪$Dᦑ⌱A.᪷⚪$EF⚪GHḄI7ᐵ;ᑡFKLḄMNOP2>*⚪.*⚪ὃ-ᵫQ▭S⚪TUFVᐗXMN2>*⚪Ḅᐵ?Y=⚪$ᑡFKLḄMN.11.ூ>ᫀ௃4ூ2᪆௃2জ\⚔^KI<=_ঝI^Ḅ⊡^KI<=_ঞ᝞db஻a,c//a,”/c,<=_ট᝞dh^Ḅijᑖklmnh^Ḅijoih^KIᡈq⊡<=ᦑ⌱A.ᑭᵨt^u⊡^ஹ\⚔^uv⊡^ஹlmwᳮxyᳮxlmzḄឋ|⌲'mᑨᓽDᑮ<=Ḅ.*⚪ὃ-t^u⊡^ஹ\⚔^uv⊡^ஹlmwᳮxyᳮxlmzḄឋ|ẠᳮL.12.ூ>ᫀ௃C8⚓ᐳ15⚓

8ூ2᪆௃2:2018+4=504...2,V⚔42018504hᫀ௃±V3ூ2᪆௃ூᑖ᪆௃*⚪°⌕ὃ-lM᪷4"ºlM᪷lM᪷»ᐵ?.ᵫ®=3,½᪷lM᪷»¾2ᓽ.ூ2>௃2vV9=3,•••ᡃḄlM᪷ÂÃ.ᦑ>ᫀÂÄ.14.ூ>ᫀÅÆூ2᪆௃2᪷⚪$Ç⌕ÈÉMNHḄÊhMN¥ËÌᓽ••Í?V1>ᫀÏÐÑÒV;ÍᐭÕÉ,Öᔠ⌕¾.ᦑ>ᫀ>ᫀÏÐ.✌ᐜᑏFihx,yḄ!"ḄÝÞᓽᑏFMN>ᫀÏÐ.*⚪°⌕ὃ-VᐗXMNḄ2Ḅ»<=ᳮ2»2⚪Ḅᐵ?.15.ூ>ᫀ௃—1,2ூ2᪆௃ூ2>௃2ßàl☢â^ᙶ᪗;᝞±“ä”ᡠᙠḄḄᙶ᪗-1,2.ᦑ>ᫀ1,2.

9ூᑖ᪆௃᪷“æ”Ḅᙶ᪗ᔣè2hᓫ(ᔣê1hᓫ(ᙶ᪗¦ßàl☢â^ᙶ᪗;ᯠᑏF“ä”Ḅᙶ᪗ᓽ.*⚪ὃ-ᙶ᪗=(ìẠ⚪í==Fᙶ᪗¦Ḅ(ì2⚪Ḅᐵ?.16.ூ>ᫀ௃150°ூ2᪆௃2î8ïBE//4D,-AD//CF,•••BE//AD//CF,/.ABE=44=110",EBC+“=180°,v^LABC=140°,4ABE+4EBC=4ABC,4EBC=30°,4c=150°.ᦑ>ᫀ150஺.✌ᐜîBïBE஻AD,ᵫAD஻CF,DBE஻4D஻CF,ᯠ᪷iâzlmᑁ┯^KIiâzlmóôᑁ^q⊡ᓽ¾DNCḄõᦪ.¶⚪ὃ-lmzḄឋ|.¶⚪öõÏᜧ2⚪Ḅᐵ?#$iâzlmᑁ┯^KI4iâzlmóôᑁ^q⊡ᳮḄLᵨ#$ᦪᔠ÷øḄLᵨ#$ùúzḄïû.17.ூ>ᫀ௃5aDx>a—1,ᦑÏIÝḄ2üa—l

10ூ᪆௃9:;<=>?@>ABCDEF;?=T>AB.19.ூᫀ௃:>U*VWᔙ+2?=815x-18y=992ᵫজ-ঝy=—^ᐭজx=6.x=6ᡠa:>U*Ḅ1.{y--2ூ᪆௃b⚪cᐜefghᦪiᦪḄᨬklmᦪᵨGHoᐗ0;<.b⚪pqᓫ⌕tuᐗ')>Uv>U*Ḅ0wJ.20.ூᫀ௃ᵫ3%-2Wx+6,x<4,---+1>x,>0,ᑣ*Ḅ0

11n=500-120-140-40=200(3)4*ᡧWḄᙊ«Ḅ¬ᦪ20+500=14.4°(4)(4)120+500x3200=768()¯°ᐰ᪥3200³´µ᜜▅¸cᙠ20kca¹(»20kc)Ḅ³´¼ᨵ768.(1)᪷஺§Ḅ¦ᦪ-140,ᡠᓰḄ¾¿-28%,ᓽJ¥¦ᦪᯠ᪷Àᑖ¾ḄÁcḄ|ᳮAஹB§Ḅ¥¦ᦪᑣaḄᓽJ;Â஻Ḅ(2)᪷(1)ḄÃÄᓽJÅ(3)᪷ᡧWḄᙊ«Ḅ¬ᦪᓽJ.(4)᪷Àᑖ¾ḄᓽJ."⚪ὃ%¸⚣ᦪᑖÇ>ÈḄPÉ?ᑭᵨË°ÈÌÍÎḄPÉᑭᵨË°ÈÌÍÎcÏÐÑÒÓÔஹᑖ᪆ஹẆÖË°È×PÅRSḄᑨØ?ÙÚ⚪.23.ூᫀ௃প•••8ÜஹDEᑖÝUᑖÞ4BD?NBCC,••Z.ABD=2Z.1,BDC=242,•!AB“CD,"ABD+BDC=180°,ᓽ241+242=180°,••zl+Z2=90°(2)DEᑖ4BDC,Z2=4O°,ᵫ(1)Þ1+Þ2=90°,AZ.1=9O°-Z2=5O°,y.-AB//CD,•zl+Z.3=180°,z3=180°—41=130°.512⚓ᐳ15⚓

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+"x=y,,x=--ᐭঝ*+"10y=F16104%+5y=4x—+5x(--)

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+"a=-1,,a=-l-ᐭঠ*+"6=5,2,ঞX(-1)+টx5,*+"7%-7y=4x(-1)+6x5=26Bব>W16+"2%,ঢxc+ণxd,*+"(2c+3d)%+(c+2d)y,>(2c+3d)x+(c+2d)y=x-3y,OPQᦪ*+"2c+3d=1@c+2d———3(10)ᵫত-থx2,*+"—d=7,
+:d=-7,,d=-7-ᐭত*+"c=11,•••ঢX11b11<22x+lly<22,@x(%7)b-49<-21%-14y<-28,2ঢx11+ণx(—7)>*+:—38

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